JPH046054A - Method for protecting sheet lens - Google Patents

Abstract

PURPOSE:To prevent a first lens and a second lens from being in contact with each other and securely prevent white powder from being generated by taking out a protection sheet from between the first and second lenses after electrical adjustment and transportation of a back projecting type projector is done with the protection sheet interposed between the first and second lenses. CONSTITUTION:A first lens is formed of plastic in a rectangular wrench lens while a sheet protection layer 4 is formed on one end (upper end) of the lens 1 by winding an acetate tape, wherein the sheet protection layer 4 protects a protection sheet from an edge of the upper end of the first lens 1. After a screen is attached to a cabinet 10, a protruding part of the protection sheet 3 which has been overlaid on a front face of the first lens 1 is folded back to overlay the protruding part on an upper face of the cabinet 10, and with an adhesive tape 15 fixed, electrical adjustment such as registration alignment or the like and transportation is performed in this state.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for protecting a sheet-like lens of a rear projection type projector.

[Summary of the invention; The present invention provides sorted first . A protective sort is sandwiched between the second lenses, and the protective note prevents the first and second lenses from coming into direct contact with each other, and the vibrations of the first and second lenses can be applied to the first and second lenses during transportation. In a method for protecting a sheet-like lens of a rear projection type projector, which prevents the second lens from rubbing against each other and generating lens abrasion powder called white powder,
A transparent and thin protective sheet is used as the protective sheet, and the sort is sandwiched between the 12th and 2nd lenses, and a part of it is placed between the 12th and 12th lenses. By protruding from between the second lenses, it is possible to perform register alignment on the screen, electrical adjustment such as soenog, and transport with the protective sort sandwiched in between, and also allows transportation to be completed. Later, the first
．． The protective sorting can be easily pulled out from between the second lenses.

[Prior art] Rear projection type projection TV (hereinafter referred to as projector)
In general, a screen is formed by overlapping two lenses (hereinafter referred to as first and second lenses), a lenticular lens and a Fresnel lens, which are made in sheet form from plastic or the like.

By the way, the above 1. When a sharp uneven portion is formed on at least one of the overlapping surfaces of the second lens,
The polymerized surfaces rub against each other and wear out, generating white powder.

Therefore, in order to protect the sheet-like lens in the above-mentioned case, a sheet-like first lens is used as shown in FIG. Radius 20xz between second lenses 101 and 102, thickness 0.15zz
The plastic tapes 103...103 of about 100 lbs.
A method of protecting a sheet-like lens is adopted in which the overlapping surfaces of the second lenses 101 and 102 are prevented from rubbing against each other. (The reason why the tapes +03...103 are held in the shape of a tab is to prevent the tapes 103...+03 from touching the adjustment points).

1. Problems to be Solved by the Invention 2. By the way, the above-mentioned conventional tape 103 is The method of protecting the sheet-like lens sandwiched between the second lenses 101 and 102 has the following problems.

(+) 1st. Since the width of the tape 103 is narrow compared to the size of the second lenses 101 and 102, the portions where the tape 103 is not sandwiched easily come into contact with each other.

(2) First. In order to reliably prevent the second lenses 101 and 102 from coming into contact with each other, it is necessary to sandwich a number of tapes 103 as shown in FIG.
(pinching work) and removal work are troublesome.

Furthermore, it is difficult to prevent the tapes 103...103 from touching the adjustment points.

(3) Since the tape thickness increases at the cross portions of the tapes 103...103, electrical adjustment such as registration on the screen may become difficult.

The present invention has been made with the object of providing a method for protecting notebook-shaped lenses that solves the above-mentioned conventional problems.

[Means for Solving the Problems] In the sheet-like lens protection method of the present invention, a sheet-like first lens. The first lens is transparent and thin between the second lenses. A protective sheet of a size corresponding to the size of the second lens is sandwiched with a part sticking out, and the first and second lenses are fixed to each other and installed in the cabinet of the rear projection type projector. ．． After performing the electrical adjustment and transportation of the rear projection type projector with the protective notebook sandwiched between the second lenses, the above-mentioned step 1. The protective sheet was removed from between the second lenses.

[Function] Sheet-like first. Electrical adjustments can be made on the screen while the protective sheet is sandwiched between the second lenses.

After completing the electrical adjustment, the lenses are transported with the protective notebook sandwiched between them to reliably prevent the lenses from coming into contact with each other and generating white powder during transportation.

Then, after transportation is completed and the product is delivered, if the end user picks up and pulls the part of the protective sheet protruding from between the first and second lenses, the protective sheet will be removed from the first and second lenses. It will be easily pulled out from between the second lenses.

[Example] Next, a method for protecting a sheet-like lens according to the present invention will be described with reference to the drawings.

In FIG. 1, 1.2 is a sheet-shaped first . The second lens, 3, is the first lens. Second lens 1.2
A protective sheet is sandwiched between the two.

The first lens 1 is formed into a rectangular wrench lens made of plastic, and a sheet protective layer 4 is formed by wrapping an acetate tape around one end (upper end) of the first lens 1. With the protective layer 4,
The protective sheet is designed to protect the upper edge of the first lens l.

The second lens 2 is formed of plastic into a rectangular Fresnel lens having approximately the same size as the first lens 1, and is superimposed on the back surface of the first lens 1.

Further, the protective sheet 3 is transparent and thin (thickness 0.0
5u+) CPP film, the above-mentioned first. Second
The width W is slightly smaller than the width WI of the lens 1.2 of the first lens. The length of the second lens 1.2 is about 1.5 times the length Ll, and it is formed into a rectangular shape.

Then, as shown in FIG. 2, the upper end side of the protective sheet 3 is made to protrude, and the 1st and 2nd lenses 1.2 are overlapped with the lower end side sandwiched between them. The second lens 1.2 is bordered on three sides, both right and left ends and the bottom end, with adhesive tapes 5, such as acetate tape. While the second lens 1.2 is combined, the protrusion of the protective sheet 3 is folded back and overlapped with the front side of the first lens 1.

Then, as described above, the left and right ends and the bottom end are joined together with adhesive tapes 5...5, and the protective notebook 3 is partially protruded from the top end. As shown in FIG. 4, the second lens 1.2 has a pair of upper and lower first lenses on its upper and lower end sides. It is installed in the screen installation opening 11 of the projector cabinet IO with the second screen holder 6.7 positioned, and the left and right ends positioned by a pair of left and right third and fourth screen holders 8.9. It looks like this.

12...12 and 13...13 are washers and screws for attaching the first to fourth screen holders 6 to 9 to the openings of the cabinet 10, and 14 are the first to fourth screen holders.
A protective notebook is a screen cover that covers the surfaces of the screen holders 6 to 9, and is folded back on the upper end side of the first screen holder 6 and the screen cover 14 that support the upper end side of the screen and the front side of the first lens 1. 3
An appropriate gap is provided between the first screen holder 6 and the screen cover 14, so that the protective notebook 3 can be inserted into the first screen holder 6 and the screen cover 14 with the first screen holder 6 and screen cover 14 attached. It is designed so that it can be pulled out from between 1° and 2 of the second lens.

After attaching the screen to the cabinet 10 as described above, as shown in FIG. It is superimposed on the upper surface of the IO and fixed with adhesive tape 15, and electrical adjustment such as register alignment and transportation are performed in this state.

When the protective sheet 3 is no longer needed after transportation, the protruding portion of the protective sheet 3 is peeled off from the top surface of the cabinet 10 as shown in FIG. 6, and the protruding portion is removed as shown in FIG. If you pull it downward as shown above, the protective sheet 3 will move to the first position. It will be pulled out from between 1° and 2 of the second lens.

Reference numeral 16 denotes a caulk label provided on the back side of the protrusion of the protective sheet 3, and the label 16 describes how to handle the protective sheet 3 and the like.

In the embodiment, a CPP film with a thickness of 0.05xx was used as the protective sheet 3, but the protective notebook 3 is not limited to the CPP film, and the important thing is to protect the first and second lenses! It needs to be thin and transparent enough to allow electrical adjustment while being sandwiched between the two, and have enough mechanical strength that it will not tear when pulled out.

[Effects of the Invention] Since the method for protecting a sheet-like lens of the present invention has the structure as described above, it has the following effects.

(1) First. I placed a protective notebook of a size commensurate with the size of the second lens, so I decided to use the first one. It is possible to prevent the second lenses from coming into contact with each other and to reliably prevent the generation of white powder.

(2) First, because a transparent and thin protective sheet was used.
Electrical adjustments such as registration alignment can be performed while the lens remains sandwiched between the second lenses.

Also, after the transportation is completed, by pulling the protrusion of the protective sheet, the first. The protective notebook can be easily pulled out from between the second lenses.

(3) Since the protective notebook was thinly removed, the first thing to do is to remove the protective notebook. Since the clearance between the second lenses is extremely small, it is possible to suppress rattling and the effect on the image.

[Brief explanation of the drawing]

Figure 1 is a perspective view before the protective sheet is sandwiched, Figure 2 is a sectional view along the ■-shoreline of Figure 1, Figure 13 is a perspective view with the protective sort sandwiched in, and Figure 4 is before the screen is installed in the cabinet. FIG. 5 is a perspective view of the screen attached to the cabinet, FIGS. 6-7 are perspective views showing the process of pulling out the protective sheet, and FIG. 8 is a perspective view of a conventional example. 1.2... 1st. Second lens, 3...protective sheet,
10...cabinet. #'l-view of I1mi East Itari σ6 Figure 8

Claims (1)

[Claims] (1) The first lens is transparent and thin and can be electrically adjusted while being attached between the sheet-like first and second lenses;
A protective sheet of a size corresponding to the size of the second lens is sandwiched with a part thereof protruding, and the first and second lenses are fixed to each other and installed in the cabinet of the rear projection type projector; After the rear projection projector is electrically adjusted and transported with the protective sheet sandwiched between the second lens, the protective sheet is removed from between the first and second lenses. A distinctive method of protecting sheet lenses.