JPH08254755A - Screen device for back projection system projector - Google Patents

Abstract

PURPOSE: To eliminate rubbing between two screens due to the vibration at the time of transporting a device, to prevent scratches on the screen surfaces and to obtain a good picture by arranging a gap between two screens at the time of transporting the device, as for the screen device for a back projection system projector with two screens disposed to face oppositely. CONSTITUTION: A lenticular lens 2 is always fixed on a screen frame 1, a Fresnel lens 3 is fixed on the screen frame 1 with a leaf spring member 6 by a Fresnel lens fixture 4 and a screw 11. When the screw 11 is unfastened, a gap is formed between the lenticular lens 2 and the Fresnel lens 3 by the spring force of the leaf spring member 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen device for a rear projection type projector in which a lenticular lens and a Fresnel lens are arranged to face each other, and more particularly, to a rear projection having a structure for preventing damage to the lens during transportation of the screen. Method The present invention relates to a screen device for a projector.

[0002]

2. Description of the Related Art At present, the mainstream of screens for rear projection type projector screen devices is a two-element screen in which a lenticular lens and a Fresnel lens are arranged opposite to each other. A conventional fixing structure for a two-piece screen will be described with reference to FIGS. 7 and 8. 7 is an exploded perspective view showing a lens fixing structure in a conventional screen, and FIG. 8 is a sectional view taken along the line AA of FIG. 7 in the assembled state of the screen.

As shown in the figure, in the conventional configuration,
The lenticular lens 22 and the Fresnel lens 23, together with the cushioning material 25 and the cushioning material 26, are in a superposed state.
With the mounting bracket 24 and the set screw 27, the screen frame 21
Fixed to the back of the. In this state, the fixed lenticular lens 22 and Fresnel lens 23 are
The peripheral portion is in surface contact, but the central portion is in a non-contact state with a minute gap.

[0004]

However, in this conventional rear projection type screen device for a projector, since there is a minute gap between the lenticular lens 22 and the Fresnel lens 23, the lenticular lens due to vibration during screen transportation. 22 and the Fresnel lens 23 rub against each other, and the lens surface may be scratched, which causes image deterioration of the screen.

In order to avoid the contact between the lenticular lens and the Fresnel lens during such transportation, a protective sheet is placed in the gap between the lenticular lens and the Fresnel lens, and the protective sheet is transported in this state. Some of them have a structure that allows them to be pulled out from between (Saikai Sho 64-47176).

However, in such a structure, there is a problem in that the protective sheet needs to be inserted between the lenses at the time of assembling the screen and removed after the screen is installed, resulting in an increase in the number of steps. Also, the protective sheet
When pulling out from between the lenses, scratch the lens,
There is a problem in that it is necessary to select a material that does not break and it is necessary to carefully select the material.

The present invention has been made to solve these conventional problems, and rear projection capable of preventing lens damage during transportation with a simple structure without interposing a protective sheet or the like. An object of the present invention is to provide a screen device for a projector.

[0008]

In order to achieve the above object, the present invention is a rear projection type projector screen device having a structure in which a lenticular lens and a Fresnel lens are opposed to each other, and the lenticular lens is fixed to a screen frame. A fixing metal fitting, a fixing metal fitting for fixing the Fresnel lens to the screen frame, and a leaf spring member located between the Fresnel lens and the screen frame for pressing the Fresnel lens in a direction away from the screen frame. It is provided with a configuration.

In the above structure, the plate spring member is integrally formed or divided into a plate piece and a spring, and is fixed to the screen frame together with a fixing fitting for fixing the Fresnel lens.

Further, according to the present invention, a stepped portion is provided at a peripheral portion of a side surface of the lenticular lens of the Fresnel lens so as to form a space for positioning the leaf spring member between the lenticular lens and the Fresnel lens. is there.

[0011]

In the screen device for a rear projection type projector of the present invention having the above structure, the leaf spring member disposed between the lenticular lens and the Fresnel lens acts by loosening the fixing metal fitting for fixing the Fresnel lens during transportation of the screen. And press the Fresnel lens in a direction away from the lenticular lens. This allows
The Fresnel lens is sandwiched between the leaf spring member and the fixture at a position apart from the lenticular lens,
Both lenses will not come into contact with each other due to vibration during screen transportation.

[0012]

Next, the present invention will be described with reference to the drawings. 1 is an exploded perspective view showing an embodiment of the present invention, FIG.
FIG. 2 is a sectional view taken along the line AA of FIG. 1 in a screen assembled state showing a mounted state of a lenticular lens. As shown in the figure, the lenticular lens 2 and the Fresnel lens 3
Is fixed to the screen frame 1 in a superposed state, but these lenses 2 and 3 are individually and independently attached to the screen frame 1. First, the mounting structure of the lenticular lens 2 will be described.

In the figure, reference numeral 5 is a short fixing metal fitting (hereinafter, lenticular lens fixing metal fitting 5) for fixing the lenticular lens 2 to the screen frame 1, and is arranged at the center of each of the four sides of the lenticular lens 2. As shown in FIG. 2, the lenticular lens fixing bracket 5 is fixed to the screen frame 1 with screws 10, and presses and holds the center of the four sides of the lenticular lens 2 on the screen frame 1. The cushioning materials 7 and 8 are provided on the contact surface between the screen frame 1 and the lenticular lens 2 and the contact surface between the lenticular lens 2 and the lenticular lens fixing bracket 5, so that the lenticular lens 2 is not damaged. It has become.

Next, the mounting structure of the Fresnel lens 3 on the screen frame 1 will be described. FIG. 3 is a sectional view taken along the line BB of FIG. 1 in the assembled state of the screen showing a mounted state of the Fresnel lens, and FIG. In the figure, reference numeral 4 is a short fixing metal fitting (hereinafter, Fresnel lens fixing metal fitting 4) for fixing the Fresnel lens 3 to the screen frame 1, and the Fresnel lens 3 is attached so as to avoid the mounting position of the lenticular lens fixing metal fitting 5. Are arranged at two locations on each side of the.

As shown in FIG. 3, the Fresnel lens fixing member 4 is fixed to the screen frame 1 with screws 11, and presses and holds the four corners of the Fresnel lens 3 on the screen frame 1. A cushioning material 9 is also interposed between the Fresnel lens 3 and the Fresnel lens fixing fitting 4.

In the figure, reference numeral 6 is a leaf spring member, the base end portion of which is fixed to the screen frame 1 together with the Fresnel lens fixing bracket 4 by a screw 11 and the tip end portion of which is the lenticular lens 2 at the lens peripheral portion. And Fresnel lens 3
It is located between and. That is, the Fresnel lens 3
A step portion 12 is formed in the peripheral portion of the lenticular lens 2 side, and the step portion 12 forms a space between the lenticular lens 2 and the Fresnel lens 3 for positioning the tip end portion of the leaf spring member 6. Has been done.

The leaf spring member 6 is made of an elastic material and, as shown in FIG. 4, is shaped so that its tip end side is slightly expanded toward the Fresnel lens 3 side in normal times. As shown in FIG. 3, in the fixed state of the Fresnel lens 3, the tip end portion of the leaf spring member 6 is pressed toward the lenticular lens 2 side by the step portion 12 of the Fresnel lens 3 and elastically deforms,
As a result, the lenticular lens 2 and the Fresnel lens 3
Come into contact with each other and the screen is in use.

On the other hand, as shown in FIG. 4, by loosening the screw 11, the spring force of the leaf spring member 6 works to press the Fresnel lens 3 away from the lenticular lens 2. In this state, the Fresnel lens 3 is sandwiched between the leaf spring member 6 and the Fresnel lens fixing bracket 4, and is separated from the lenticular lens 2 so that a gap is formed between both lenses.

According to the present invention having the above-mentioned structure, when the screen device is installed, the leaf spring member 6 is deformed by the Fresnel lens 3 and the Fresnel lens 3 becomes the lenticular lens 2 by completely tightening the screw 11 as shown in FIG. It is fixed to the screen frame 1 together with the cushioning material 9 in a surface contact state. At this time, the leaf spring member 6 is the Fresnel lens 3
It is accommodated in the gap between the lenticular lens 2 and the Fresnel lens 3 generated by the stepped portion 12 provided in the peripheral portion of the. On the other hand, when the screen device is transported, by loosening the screw 11 as shown in FIG. 4, the Fresnel lens 3 is loosened by the spring force of the leaf spring member 6 together with the Fresnel lens fixing bracket 4 and the cushioning member 9. The distance from the lenticular lens 2 is maintained. At this time, the lower end surface of the Fresnel lens 3 is received by the Fresnel lens fixing bracket 4, and the downward shift of the Fresnel lens 3 is prevented. The screw 11 is tensioned in the head direction by the spring force of the leaf spring member 6 and does not loosen due to vibration.

FIGS. 5 and 6 show another embodiment of the present invention. In this embodiment, the leaf spring member 6 is a plate piece 6a which is in contact with the step portion 12 of the Fresnel lens 3, and this plate piece. Is divided into a spring 6b for pressing the Fresnel lens 3 side. In the embodiment shown in FIG. 5, a disc spring is used as the spring 6b, and in the embodiment shown in FIG. 6, a coil spring is used as the spring 6b. In this case, the spring 6b can be used as a spring having a strong spring force, so that a strong holding force is maintained against vibration and the like. In FIG. 5 and FIG. 6, a seat 13 that functions as a recess for the spring 6b is formed around the screw 11 of the screen frame 1.
3 can be omitted.

[0021]

As described above, in the rear projection type projector screen device according to the present invention, a gap corresponding to the size of the screen can be easily provided between the lenticular lens and the Fresnel lens during transportation. In addition, it is possible to prevent the lenticular lens and the Fresnel lens from rubbing against each other due to vibration during transportation, and to prevent the screen surface from being scratched. As a result, a good image can be obtained.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a screen device for a rear projection type projector according to the present invention.

FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1 in the assembled state of the screen showing the attached state of the lenticular lens.

FIG. 3 is a sectional view taken along line BB in FIG. 1 in an assembled state of the screen showing a mounted state of the Fresnel lens.

FIG. 4 is a cross-sectional view taken along the line BB of FIG. 1 when the screen is transported.

FIG. 5 is a view corresponding to a sectional view taken along line BB in another embodiment of the present invention.

FIG. 6 is a view corresponding to a sectional view taken along line BB in yet another embodiment of the present invention.

FIG. 7 is an exploded perspective view showing a lens fixing structure in a conventional screen.

8 is a cross-sectional view taken along the line AA of FIG. 5 in the assembled state of the screen.

[Explanation of symbols]

 1 Screen Frame 2 Lenticular Lens 3 Fresnel Lens 4 Fresnel Lens Fixing Fixture 5 Lenticular Lens Fixing Fixture 6 Leaf Spring Member 7, 8, 9 Buffer Material 10 Screws 11 Screws 12 Steps 21 Screen Frame 22 Lenticular Lens 23 Fresnel Lens 24 Mounting Fixture 25 , 26 cushioning material 27 screws

Claims (4)

[Claims] 1. A screen device for a rear projection type projector, wherein a lenticular lens and a Fresnel lens are arranged to face each other, and a fixing fitting for fixing the lenticular lens to a screen frame, and the Fresnel lens to the screen frame. A screen device for a rear projection type projector, comprising: a fixing bracket; and a leaf spring member that is located between the Fresnel lens and the screen frame and presses the Fresnel lens in a direction away from the screen frame. . 2. The screen device for a rear projection type projector according to claim 1, wherein the leaf spring member is integrally formed, and is fixed to the screen frame together with a fixing member for fixing the Fresnel lens. 3. The rear projection according to claim 1, wherein the leaf spring member is divided into a leaf piece and a spring, and each of them is fixed to the screen frame together with a fixing member for fixing the Fresnel lens. Method Projector screen device. 4. A step portion is formed at a peripheral portion of a side surface of the lenticular lens of the Fresnel lens so as to form a space for positioning the leaf spring member between the lenticular lens and the Fresnel lens. The screen device for a rear projection type projector according to claim 1, 2, or 3.