JPH0736242U - Handwriting input device - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent the reflection of light from the surface of the glass plate that receives the stylus indicating the coordinates and to prevent the glass from scattering when the glass plate is broken. [Structure] Transparent glass plate 1 in cases 12 and 14
0, the liquid crystal display device 8, and the tablet substrate 6 for coordinate detection are arranged in this order from the top. Glass plate 10
Is disposed so as to face the opening 12a of the upper case 12. A light reflection preventing surface 12a is formed on the surface of the glass plate 10 by a non-glare treatment, and a transparent film 22 is attached to the back surface of the glass plate 12 to prevent scattering when the glass plate 12 is broken.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a handwriting input device in which a tablet substrate for detecting coordinates designated by a stylus pen and a liquid crystal display device are overlapped with each other and coordinate designation input and display are performed through a glass plate.

[0002]

[Prior art]

 In this type of handwriting input device, non-glare processing (frost processing) is performed on the upper surface of the glass plate to prevent reflection of external light. As a method of this non-glare treatment, Japanese Patent Laid-Open No. 173707/1993 discloses a structure in which a non-glare film is attached to a glass plate. Further, Japanese Patent Laid-Open No. 4-60824 discloses a configuration in which a non-glare treatment is performed on the glass surface.

[0003]

[Problems to be solved by the device]

 If a non-glare film is attached to the glass plate, the stylus pen scratches the film, causing the film to peel off from the glass plate. In addition, this structure has a problem in that the method of reflecting light and the writing quality of the stylus pen differ depending on how the film is applied, and the manufacturing process is not stable. Further, in the case of the structure in which the glass surface is subjected to the non-glare treatment, the above problem can be solved, but when the glass is broken, the glass is scattered. The present invention is intended to solve the above problems.

[0004]

[Means for solving problems]

 In order to achieve the above-mentioned object, the present invention detects a coordinate of a position pointed by a stylus pen on a transparent glass plate, a liquid crystal display device and a tablet substrate for coordinate detection, which are superposed. In addition, in a handwriting input device capable of displaying data of characters and figures on the liquid crystal display device, a light reflection prevention surface is formed by non-glare treatment on the surface of the glass plate to prevent scattering on the back surface of the glass plate. It is a transparent film that is used for bonding.

[0005]

[Action]

 Since the surface of the glass plate is subjected to anti-glare treatment, it effectively prevents the reflection of light, and does not scatter even if the glass plate breaks.

[0006]

【Example】

 Hereinafter, the configuration of the present invention will be described in detail with reference to the embodiments shown in the accompanying drawings. In FIG. 1, reference numeral 2 is configured so that a tablet substrate 6 for detecting coordinates designated by the stylus pen 4 and a liquid crystal display device 8 are superposed, and coordinate designation input and display are performed through a glass plate 10. The handwriting input device is shown. Reference numeral 12 is an upper case to which a lower case 14 is fitted.

The tablet substrate 6 is fixed to the mounting portion 12 b of the upper case 12. Reference numeral 8 denotes a plate-shaped liquid crystal display device (LCD), and a thin electrostatic shield 16 is sandwiched between the liquid crystal display device (LCD) and the tablet substrate 6, and the display device 8 is fixed to the tablet substrate 6 with a screw. ing. A spacer 18 and an electromagnetic shield 20 made of mumetal are bonded to the lower surface of the tablet substrate 6.

Reference numeral 10 is a transparent glass plate placed on the liquid crystal display device 8, and a non-glare light reflection preventing surface 10 a is formed on the upper surface thereof. This non-glare treatment is carried out, for example, by immersing a transparent panel such as glass in a hydrofluoric acid-based aqueous solution to corrode its surface. A transparent film 22 is attached to the lower surface of the glass plate 10 to prevent scattering when the glass is broken. The glass plate 10 is arranged so as to face the opening 12 a of the upper case 12, and the peripheral portion is fitted and arranged in a fitting recess formed in the upper case 12.

[0009]

【effect】

 As described above, according to the present invention, since the surface of the glass plate is directly subjected to the non-glare treatment, it is possible to obtain a good anti-reflection effect without variation, and even when the glass plate is broken, it is scattered on the back surface of the glass plate. Since a transparent film is attached for prevention, the glass plate is safe without scattering. Moreover, since only the non-glare treatment on the glass surface and the film on the back surface are attached, the manufacturing process is very easy and the quality is stable.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a handwriting input device.

FIG. 2 is an explanatory sectional view of a handwriting input device.

FIG. 3 is a side sectional view of the handwriting input device.

[Explanation of symbols]

 2 Handwriting input device 4 Stylus pen 6 Tablet substrate 8 Liquid crystal display device 10 Glass plate 12 Upper case 14 Lower case 16 Electrostatic shield 18 Spacer 20 Electromagnetic shield 22 Transparent film

Claims (1)

[Scope of utility model registration request] 1. A transparent glass plate (10), a liquid crystal display device (8), and a tablet substrate (6) for coordinate detection are superposed on each other, and an instruction is given by a stylus pen (4) on the glass plate (10). In a handwriting input device capable of detecting position coordinates and displaying character and graphic data on the liquid crystal display device (8), a light reflection preventing surface (a non-glare treatment surface on the surface of the glass plate (10) ( 10a) is formed, and a transparent film (22) for preventing scattering is adhered to the back surface of the glass plate (10).