JPH0418302Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to an improvement of a so-called reflective video projector.

(b) Prior Art In order to make a reflective video projector more compact, for example, a configuration in which the screen frame is stored in the rear part of the cabinet so that it can be raised and lowered, and the reflective mirror is placed on the inner surface of the folding plate of the front door is proposed. US Patent No.
It is publicly known from Publication No. 4281352 and the like.

However, in this conventional example, the distance between the reflector and the screen is kept as short as possible, and the screen is tilted forward at a predetermined angle in order to direct it to the optimal viewing position, or the screen is tilted forward at a predetermined angle at the use position. The present invention provides a satisfactory means for solving problems such as how to compactly store a screen that is installed tilted forward in a cabinet, and how to reduce the force applied to the screen when the screen is pulled out or stored. It wasn't something I did.

(c) Problems to be solved by the invention This invention solves the problems of the conventional examples as mentioned above, namely:
In a reflective video projector where the screen is used with the screen tilted forward, we have solved the problem of storing the screen and enlarged projection image light source in the cabinet extremely compactly and without applying excessive force when not in use. It is something to be solved.

(d) Means for solving the problem The lower end of the screen support frame is pivoted to an elevating device, and the screen frame is gradually tilted forward as the elevating device is raised by guide means, and the screen frame is gradually tilted forward at the upper end. The screen support frame is held at a predetermined angle, and an enlarged projection image light source is installed and fixed in parallel to the board of the front door.

(E) Function The screen support frame, whose lower part is pivoted to the lifting platform,
Store the video projector vertically at the rear of the cabinet when not in use. In use, when the screen support frame is raised by the lifting device, the screen support frame is gradually tilted forward by the guide means. At the upper end of the guide means, the screen frame assumes a predetermined forward tilt angle and is fixed by the holding means.

(F) Embodiment Details of the video projector of the present invention will be explained below with reference to FIGS. 1 to 4.

The video projector of the present invention basically comprises a cabinet body 10, an enlarged image projection light source 20, a reflector 30, a screen 40, and a front door 50.

The cabinet main body 10 is a box that houses a device 11 serving as a video signal source such as a television receiver or VTR, a speaker 12, etc., and has a flat rectangular parallelepiped shape that stores a screen 40 vertically together with its support frame 41 at the rear. A storage chamber 13 is provided.

The enlarged image projection light source 20 is an integrated block consisting of a high-brightness CRT projection tube 21 for projecting video signal information from a device serving as the video signal source, for example, a television receiver 11, and an enlarged projection lens 22. Each block is supported and fixed inside the base plate 51 of the front door via a front plate 53 which also serves as a front cover 52. In this case, it is very convenient for manufacturing and servicing if the television receiver 11 is installed together with the blocks of the projection tube 21 and magnifying projection lens 22 as a television receiver on the inner surface of the front door board 51. It is.

The reflecting mirror 30 is fixed to the inner surface of the dogleg-shaped bent plate 54 of the front door, and when the front door 50 is opened and fixed to the front (see FIG. 1), the enlarged image projection light source The projected light from 20 is reflected to form a projected image on a screen 40 which is tilted forward and fixed upwardly at the rear of the cabinet body 10.

The front cover 52 includes a front plate 53 and a cover 55 having a doglegged cross section. The angle and bending length of the bent portion 55 of the front cover 52 are determined so that the tip 56 does not come into contact with the screen 40 and its support frame 41 when the door is closed, and so that the tip 56 does not come into contact with the screen 40 and its support frame 41 when the door is opened. However, it is important to take care to abut the top surface 15 of the inclined top plate 14 of the cabinet body 10 to prevent dust from entering the interior and to maintain the aesthetic appearance.

The screen 40 and its support frame 41 are housed in the storage chamber 13 of the cabinet 10 so as to be able to move up and down.

Next, a storage/drawing mechanism for the screen support frame 41 will be explained.

This mechanism consists of an elevating device 6 that moves an elevating platform 63 in the vertical direction by a motor 62 via a wire 61.
0, a means 70 for pivotally supporting the lower end of the screen support frame 41 on this elevating table, and a means 70 for pivotally supporting the lower end of the screen support frame 41 on the elevating table, and a means 70 for pivoting the rear lower end 42 of the screen support frame 41 to the lower cabinet 20 as the elevating table 63 moves upward. A guide support device 80 that moves backward, gradually tilts the screen 40 forward as the screen support frame 41 moves upward, and holds the screen at a predetermined forward tilt angle when the elevating table 63 is fully raised. Consists of.

The elevating device 60 is in rolling contact with a vertical guide rail 64 and a guide groove 66 provided in front of the elevating platform 63 and the side wall of the storage chamber 13, respectively;
rollers 68, 69, and 71 that guide the lifting platform 63 in a vertically movable manner; and a wire 61.
When the motor 62 and the lifting table 63, which move the lifting table 63 upward via the
A reduction gear box 65 is provided to gear-lock the drive shaft of the motor.

The lifting platform 63 includes a guide block 72 that pivotally supports the rollers 68, 69, and 71, and a crossbar 73 that connects the guide blocks at both ends. This crosspiece 7
3 has a prismatic shape with a trapezoidal cross section having an inclined surface 74 that defines the forward inclination angle θ of the screen support frame 41 on the upper side, and a hinge 76 is attached near the lower end of the front surface of the screen frame 41 at the lower end 75 of the inclined surface 74. The screen frame 41 is hinged so that it can rotate by an angle θ from a forward tilted state to an upright state. In this embodiment, a hinge is used as a means for pivotally supporting the screen support frame 41. However, without using the crossbar 73, the side surface of the screen support frame 41 is directly pivotally supported on the guide block 72. On the other hand, it is also possible to adopt a configuration in which the screen support frame 41 is made rotatable and is provided with a rotation stopper that defines the forward inclination angle θ of the screen support frame 41.

The guide support device 80 is supported by a guide groove 82 provided on an inner wall 81 of the storage chamber 13 and a guide groove 82 which is pivoted near the lower end of the screen support frame 41.
2 and a guide surface 8 formed by a curved surface provided at the rear bottom of the screen support frame 41.
Consists of 4.

As shown in FIG. 2, the guide groove 80 is provided at the lower end toward the front of the cabinet 10, so that the screen support frame 41, together with the hinge 76, is in close contact with the back surface 77 of the crosspiece 73. Stand upright. The guide groove 80 has a shape that gradually curves backward as it goes upward, and by gradually guiding the roller 83 backward and bringing the lower end of the screen support frame 41 backward, Tilt the screen 40 forward.

Next, the screen drawer installation operation of the video projector of the present invention will be explained.

When the video projector is not in use, that is, when the screen 40 is stored in the cabinet 10, the screen support frame 41 is stored upright in the storage chamber 13 of the cabinet 10, as shown in the sectional view of FIG. The front door is closed. Therefore, the depth of the cabinet 10 is determined by the depth of the storage chamber 13, that is, the thickness of the screen support frame 41, and the thickness of the front door 5.
This is determined by the space occupied by the magnified projection image light source 20 and the front cover 52, which are installed and fixed in parallel to the substrate 51 of 0, and can be made quite compact. Furthermore, the bending plate 54 of the front door 50 is connected to the cabinet 1.
Forming a closed space covering the inclined top plate part 14 of 0,
Prevent dust from entering inside.

Next, in use, when the power is turned on, the motor 62, which is energized by turning on the interlocking switch, rotates the winding shaft 90 via the reduction gearbox 65 and winds up the wire 61. As the wire 61 moves in the direction of the arrow, the elevator platform 63 continues to rise, and the screen support frame 41 moves between the pivot point of the hinge 76 and the guide groove 8.
As the distance between the rollers 83 rolling within zero increases, the rollers 83 gradually tilt forward. The arrival of the lifting platform 63 at the top of the storage chamber 13 is detected by a microswitch (not shown), and the power supply to the motor 62 is stopped. At the same time, the reduction gear is locked to prevent the wire from moving backwards and to hold the platform 63 at its apex. Therefore, the screen support frame 41 has its front lower part closely aligned with the inclined surface of the lifting platform 63, and its forward inclination angle θ
is maintained as specified.

At this time, the roller 83 is located at the top of the guide groove 80, and the guide surface 84 on the back side of the screen support frame 41 comes into sliding contact with the rear inner wall surface 85 of the storage chamber 13, so that the screen support frame 41 can be easily tilted forward to a specified level. held in position.

Next, open the front door forward and fix it in the position shown in Figure 1 to complete the preparation for operation.

In the above-mentioned example, the motor 62 was used as a drive source for the lifting platform 63, but as in the above-mentioned conventional example,
It is also possible to use the opening torque of the front door. When storing the screen support frame 41, if the reduction gear 65 is unlocked and the take-up shaft 90 is free to rotate, the screen support frame 41 will push down the elevator platform 63 by its own weight. . At that time, the sliding contact between the guide surface 84 and the rear wall 85 of the storage chamber, and the guide groove 8
The friction between the roller 83 and the guide groove 80 due to the backward curvature of the roller 80 acts as a damping effect to slow down the descending speed of the elevator platform 63. In order to further strengthen the damping, it is sufficient to use a one-way brake on the wire winding shaft 90 that is activated only during reverse rotation.

(G) Effects According to the present invention, the screen, which is used in a forward-leaning state when in use, is configured so that it is stored upright in the storage chamber when stored, so the depth of the cabinet when not in use is shortened and the cabinet is made more compact. can be measured.

In addition, since the screen is configured so that the screen is gradually tilted forward by the guide means as it rises when the screen frame is pulled out, sudden force is not applied to the screen and the screen support frame, preventing damage and reducing weight. I can do it. Furthermore, the pivot means and guide means of the screen support frame can work together to provide an appropriate damping effect when the screen is stored.

[Brief explanation of drawings]

The drawings all relate to the video projector of the present invention, and FIG. 1 is a side sectional view, FIG. 2 is a side sectional view of the main part of the screen lifting device, and FIG. 3 is A--A in FIG. 2.
The A' sectional view and FIG. 4 are side sectional views when not in use. 10... Cabinet body, 40... Screen, 41... Screen support frame, 50... Front door,
30...Reflector, 20...Enlarged projection image light source, 6
3... Lifting platform, 80... Guide groove.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A screen that can be raised and lowered at the rear of the cabinet, a front door with a dogleg-shaped cross section, and a front door that is provided on the inner surface of the folding plate of the front door and expands when the door is opened. A video projector equipped with a reflecting mirror that reflects projection light from an image light source upward and forms an image on a screen installed above the cabinet, wherein the lower part of the support frame of the screen is vertically movable. A screen is tilted, which includes a means for pivoting to a stand, a guide surface formed with a curved surface on the lower part of the support frame, and a guide groove whose upper part is curved backward to guide the rise of the support frame. A video projector comprising guide means and means for holding the screen at a predetermined forward tilt angle at the upper end of the outer guide means. (2) Utility model registration claim 1, characterized in that a projection tube, etc. constituting the image light source is set and fixed so that its projected light is substantially parallel to the substrate.
Video projector as described in section.