JPH0669901U - Reflection mirror for projection TV - Google Patents

Abstract

(57) [Abstract] [Purpose] To achieve cost reduction while obtaining a clear image on a projection television reflector. [Structure] Reflection mirror 10 for projection television
In addition, a projection type television reflecting mirror, characterized in that an aluminum thin film 11 is applied on a glass plate 1, and a protective film 12 is further formed by uniformly applying a transparent paint.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a projection type television reflector.

[0002]

[Prior art]

 In general, a projection-type television projects an image projected from a cathode ray tube inside a housing onto a screen in front by a reflecting mirror. FIG. 3 is an explanatory view showing an example thereof, in which the light projected from the cathode ray tube 41 arranged below the housing 40 is projected onto the first reflecting mirror 42 arranged in the lower front portion of the housing 40, The reflected light is projected on the second reflecting mirror 43 arranged on the upper rear surface of the housing 40, and the reflected light is further projected on the screen 44 arranged on the front surface of the housing 40.

As an example of the above-mentioned reflecting mirror, as shown in FIG. 4, a thin silver film 51 is formed on the back surface of a glass plate 50, and a protective coating 52 is formed on the thin silver film 51, or as shown in FIG. an aluminum thin film 61 silicon oxide on a glass plate 60 (S _i O ₂₎ anti Ikyo 63 subjected to thin-film 62 has been known.

[0004]

[Problems to be solved by the device]

 The reflecting mirror 53 shown in FIG. 4 can be manufactured at a low cost because it is formed by a wet process by a reduction reaction of silver nitrate, but it is double or due to factors such as surface reflection of glass and internal reflection or absorption of glass plate. There is a problem that the image becomes unclear and dark, such as the image becoming dark due to the generation of triplex images and the decrease in the amount of reflected light.

On the other hand, the reflecting mirror 63 shown in FIG. 5 is provided with the silicon oxide thin film 62 to increase the light transmittance and prevent irregular reflection on the surface, so that a double image does not occur and a high image quality is obtained. To be However, in order to realize this, a vacuum vapor deposition apparatus is used and silicon dioxide, which is a dielectric, is vapor-deposited (or sputtered) at a high temperature, and the physical properties change significantly depending on the film forming conditions. It is necessary to form the film under the conditions strictly controlled (vacuum degree, amount of reaction gas O ₂ , substrate heating temperature, film formation speed, film pressure, etc.), and the cost of the vacuum evaporation system is extremely high. Become expensive.

Therefore, the present invention is to provide a low-cost reflecting mirror that realizes high image quality corresponding to future high-definition.

[0007]

[Means for Solving the Problems]

 The invention is a reflection mirror for a projection television, which is characterized in that an aluminum thin film is applied on the surface of a glass plate, and a protective film is formed by thinly and uniformly applying a transparent paint on the aluminum thin film. The system is a reflector for TV.

[0008]

[Function of the device]

 The present invention eliminates the surface reflection of incident light by projecting a clear image on a screen by applying a transparent and thin coating on an aluminum thin film with excellent reflection efficiency and durability, and it is an expensive device. Cost reduction is achieved by forming a uniform and transparent synthetic resin thin film without using.

[0009]

【Example】

 FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is an explanatory view showing its manufacturing process.

First, the dirt attached to the surface of the glass plate 1 such as a parallel plate glass is cleaned by an appropriate cleaning / degreasing process step 2 such as ultrasonic cleaning or steam cleaning. Next, the glass plate 1 was placed in the vacuum vapor deposition machine of the vacuum vapor deposition process 3, and the evaporation substance (Al ₂ O ₃ ) in the crucible was evaporated by high frequency heating or resistance heating to deposit Al on the glass plate 1. An aluminum thin film 11 is formed.

Next, an acrylic resin-based or epoxy resin-based transparent paint is applied on the aluminum thin film 2 by a flow coater coating process 5 to form a thin transparent protective film 12, and a drying process 6 and appearance / inspection are performed. Through step 7, the reflecting mirror 10 shown in FIG. 1 is manufactured. Incidentally, the protective film 12 may be spray coating other than the above, or doubzuke fried coating, and the film thickness is uniformly applied within a range of 5 to 200 μm.

In the reflecting mirror having the above-mentioned structure, as in the case where the silicon oxide film is applied to the protective layer, the transmittance of light is increased to prevent irregular reflection on the surface of the reflecting mirror, so that a double image does not occur and a high image quality is obtained. Quality is obtained.

[0013]

[Effect of device]

 According to the present invention, the cost of forming a protective film of a silicon oxide thin film over a large area and a uniform film thickness is high as described above, but the same performance is obtained by using a thin film using a transparent coating resin. However, it has become possible to provide it at low cost, and it has become possible to adapt to the high image quality and large screen required for high definition.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is an explanatory view showing an example of a manufacturing process of the present invention.

FIG. 3 is an explanatory diagram showing an outline of a projection type television which is an example of use of the present invention.

FIG. 4 is a cross-sectional view showing an example of a conventional reflection mirror.

FIG. 5 is a cross-sectional view showing another conventional example.

[Explanation of symbols]

 1 Glass Plate 2 Cleaning / Degreasing Process 3 Vacuum Deposition Process 4 Coating Process 5 Drying Process 6 Appearance / Inspection Process 10 Reflector 11 Aluminum Thin Film 12 Protective Film

Claims (1)

[Scope of utility model registration request] 1. A projection mirror for a projection television, comprising a glass plate coated with an aluminum thin film and a protective film uniformly coated with transparent paint. .