JP2562483Y2 - Projection unit of projection television - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection unit in a projection television apparatus in which a CRT (cathode ray tube) and a coupling lens are connected via a connector.
In particular, it relates to the structure of the coupler.

[0002]

2. Description of the Related Art FIG. 6 shows a conventional projection unit 1 in a CRT type projection television apparatus. The projection unit 1 is configured by connecting a CRT 2 and a coupling lens 3 with a generally cylindrical connecting metal fitting 4 made of, for example, aluminum die-casting, and sealing a cooling liquid 5 such as ethylene glycol inside the connecting metal fitting 4. .

[0003]

By the way, in a projection type television apparatus, generally, as shown in FIG. 5, the projection unit 1 is placed below so as not to obstruct the field of view of a viewer behind the projection unit 1. The projection is performed with an upward angle θ with respect to the screen 6 (this angle θ is called a projection angle). Then, the distance between the screen of the CRT 2 and the screen 6 differs between the upper side and the lower side of the screen. As shown in the figure, the CRT 2 is provided with an appropriate inclination angle α with respect to the coupling lens 3 (to be precise, the tube axis direction of the CRT 2 is relative to the lens optical axis). (At an angle) so that the entire screen is in focus. In this case, the projection angle θ of the projection unit 1 and the coupling lens 3 of the CRT 2
Is given by the following equation. α = tan ⁻¹ (n · tan θ / m) where n is the refractive index of the cooling liquid and m is the magnification of the coupling lens. Therefore, for example, in the case of a projection type television apparatus in which the projection units are configured in three stages, since the projection angle θ is different for each projection unit, a plurality of types of connecting brackets having different inclination angles α for the projection units in each stage are prepared. Must be performed, which complicates the design specifications and increases the cost.

The present invention has been made in view of the above circumstances, and a projection unit capable of easily changing the inclination angle α of a CRT with respect to a lens and capable of coping with various inclination angles α with one kind of connecting bracket. The purpose is to provide.

[0005]

In order to solve the above-mentioned problems, a projection unit according to the present invention connects a CRT and a coupling lens via a cylindrical connecting member, and further includes a CRT and a coupling lens in the connecting member. And a confined portion forming a substantially U-shaped portion at an intermediate portion between the CRT-side coupling portion and the lens-side coupling portion of the coupling device, wherein the coupling liquid is filled in the projection unit. Tool CR
An interval adjusting member for adjusting the interval between the T-side coupling portion and the lens-side coupling portion is provided.

[0006]

In the above construction, when the distance between the CRT-side coupling portion and the lens-side coupling portion of the coupler is shortened or lengthened on one side in a direction orthogonal to the lens optical axis by the distance adjusting member, a substantially U-shaped constricted portion is formed. It bends and the CRT tilts with respect to the lens. In this manner, the inclination angle α of the CRT with respect to the lens (more precisely, the inclination angle of the CRT with respect to the lens optical axis in the tube axis direction) can be set to a desired angle.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, reference numeral 11 denotes a projection unit in which the CRT 2 and the coupling lens 3 are connected via a connector, for example, a connector 12. Connection bracket 12
Is formed by, for example, aluminum die casting, has a substantially cylindrical shape, and has a CRT side coupling portion 13 and a lens side coupling portion 1.
A constricted portion 15 having a substantially U-shaped cross section is provided at an intermediate portion between the condensed portion 4 and the conical portion 4. CRT side connecting part 13 and lens side connecting part 1
4 to form projections 13a, 14a on the upper and lower surfaces, respectively.
An interval adjusting bolt 15 which is an interval adjusting member for adjusting the interval between the CRT side coupling portion 13 and the lens side coupling portion 14 is attached between the protrusions 13a and 14a. The spacing adjusting bolt 15 is engaged with the projection 14 a on the lens side coupling portion 14 so as to be rotatable without relative movement in the longitudinal direction, and is screwed into the projection 13 a on the CRT side coupling portion 13. It is screwed. A cooling liquid 5 such as ethylene glycol is sealed in the connection fitting 12 as in the related art. Further, the coupling lens 3 is provided with a lens mount 17 on the end face on the CRT 2 side, and the lens mount 17 is fixed to the connection fitting 12 by tightening and fixing the lens mount 17 to a side surface of the connection fitting 12 with a screw 18. In the embodiment, two spacing adjusting bolts 15 are provided on each of the upper surface and the lower surface of the connection fitting 12.

In the projection unit 11 having the above structure, C
When the RT 2 is inclined by the inclination angle α with respect to the coupling lens 3, for example, when the lower surface-side spacing adjusting bolt 15 is turned in the screwing direction, the lower surface-side projection 13 a and the projection 1
4a becomes narrower, and as shown in FIG.
Is attached. The inclination angle α is calculated by the above-described equation. For example, when the projection angle θ is 10 °, the refractive index of the cooling liquid n = 1.5 and the coupling lens 3
Assuming that the magnification m = 21, α = 0.72 °, which is slight, and can be easily angled by tightening the gap adjusting bolt 15. Therefore, for example, in the case of a projection type television apparatus in which the projection units 11 are stacked in three stages as shown in FIG. 4, the projection angles θ ₁ , θ ₂ , θ ₃ of the three stages of projection units 11 on the screen 6 are determined. It is necessary to make each of them different from each other.
It is necessary to make the inclination angles α with respect to the coupling lens 3 different from each other, but all of them can be dealt with by one kind of the connection fitting 12. Actually, each stage in FIG. 4 is a three-tube system of R, G, and B, and a set of these three projection units is stacked in three stages, which is a nine-tube system. Naturally, a two-stage six-tube system is also possible.

The connecting portion 13 of the connecting bracket 12 on the CRT side
In the embodiment, two spacing adjusting bolts 15 are provided on the upper surface side and the lower surface side, respectively, as the spacing adjusting member for adjusting the spacing between the lens and the lens side coupling portion 14, but the number is not limited to two and may be one or two. Three or more bolts may be provided, or a configuration may be employed in which a spacing adjusting bolt is provided only on one of the upper surface side and the lower surface side. Further, other members can be used instead of screws.

Although the above-described embodiment is for the case where the projection angle θ of the projection unit is set in the vertical direction of the screen 6, it is naturally applicable to the case where the projection angle is set in the horizontal direction. is there. That is, in the case of the three-tube type, the projection units of the three colors R, G, and B are arranged side by side. In this case, the projection unit at the center is perpendicular to the screen when viewed from above, and the left and right projection units are from the left and right. A horizontal angle is arranged so as to be directed toward the center in the width direction of the screen. In this case, the horizontal projection angle θ of the left and right projection units is such that the CRT is focused on the entire screen. It is also possible to apply the present invention to make the inclination angle α to the lens. In this case, a substantially U-shaped constriction is provided on the upper, lower, left, and right sides of the connection fitting,
In addition, the interval adjusting members are provided in up, down, left, and right.

In the present invention, the connecting member may be made of a resin material or the like in addition to the metal.

[0012]

According to the present invention, a constricted portion having a substantially U-shaped cross section is provided at the intermediate portion of the connecting member, and the distance between the CRT side connecting portion and the lens side connecting portion of the connecting member can be adjusted by the space adjusting member. Thus, the tilt angle α of the CRT with respect to the lens can be arbitrarily and easily adjusted. Accordingly, even in a projection type television apparatus which requires a plurality of projection units having different projection angles θ, it is not necessary to prepare a plurality of types of connecting tools. For example, a projection type television having a configuration in which the projection units are stacked in three stages. The device can be handled with one type of connecting tool. Further, when the projection units of the three colors of R, G, and B are arranged side by side, it is possible to cope with the horizontal projection angles θ of the left and right projection units.

[Brief description of the drawings]

FIG. 1 is a sectional view of a projection unit showing one embodiment of the present invention.

FIG. 2 is a perspective view of the projection unit of FIG.

3 is a cross-sectional view of the projection unit of FIG. 1 in a state where a tilt angle α with respect to a lens of a CRT is given.

FIG. 4 is an explanatory diagram of a tilt angle α of a CRT with respect to a lens.

FIG. 5 is a diagram for explaining an example of a case to which the present invention is applied, and is an explanatory diagram in the case of stacking three projection units.

FIG. 6 is a sectional view showing a conventional projection unit.

[Explanation of symbols]

 2 CRT (cathode ray tube) 3 Coupling lens (lens) 5 Cooling liquid 11 Projection unit 12 Connection metal fitting (Connection tool) 13 CRT side connection part 14 Lens side connection part 15 Constriction part 16 Spacing adjustment bolt (Spacing adjustment member)

Claims (1)

(57) [Scope of request for utility model registration] 1. A projection type television apparatus comprising: a CRT and a coupling lens connected to each other via a substantially cylindrical connecting member; and a cooling liquid sealed between the CRT and the coupling lens in the connecting member. In the projection unit, a constricted portion having a substantially U-shaped section is provided at an intermediate portion between the CRT-side coupling portion and the lens-side coupling portion of the coupling device, and the constriction portion between the CRT-side coupling portion and the lens-side coupling portion of the coupling device is provided. A projection unit of a projection television device, comprising an interval adjusting member for adjusting an interval.