JP-7856117-B2 - Cover member for input device, and input device

Inventors

• 藤田 直樹
• 西田 晋作

Assignees

• 日本電気硝子株式会社

Dates

Publication Date

20260511

Application Date

20240206

Claims (5)

1. It is located on the front side of the display device in the input device . An input device cover member , on the main surface opposite to the display device side, in which the leading edge of an input medium, which has an outwardly convex spherical shape, moves while in contact with the main surface , The tip of the input medium has a diameter of 1.7 to 8 mm. The aforementioned input device cover member has at least one main surface with two different types of irregularities of varying sizes . In the main surface having the aforementioned irregularities, When the cutoff value of the high-pass filter λc is set to 1.6 times the spacing width of the large irregularities in the measured cross-sectional curve, and the cutoff value of the low-pass filter λs is set to 25 μm , the spacing width of the large irregularities is: It is 500 to 3000 μm, and When the width of the large unevenness is A and the diameter of the tip of the input medium is B, the relationship between the two satisfies 0.13 ≤ [A/B] ≤ 0.79 . In the main surface having the aforementioned irregularities, When the cutoff value of the high-pass filter λc is set to 25 μm, the spacing width of the small irregularities is 2.4 to 2.9 μm. A cover member for an input device characterized by the following features.
2. In the main surface having the aforementioned irregularities, When the cutoff value of the high-pass filter λc is set to 1.6 times the spacing width of the large irregularities in the measured cross-sectional curve, and the cutoff value of the low-pass filter λs is set to 25 μm, the maximum height and width of the large irregularities is 25 to 125 nm . The cover member for an input device according to claim 1, characterized in that...
3. The haze is less than 10% in the visible light wavelength range. A cover member for an input device according to claim 1 or claim 2 , characterized in that...
4. The device comprises an input device cover member, a display device, and a detection circuit for detecting input, as described in any one of claims 1 to 3 . An input device characterized by the following features.
5. The input medium provides input to the input device by moving while in contact with the main surface of the cover member for the input device , The aforementioned input medium is It is an input pen having a tip that has a convex spherical shape on the outside . The input device according to claim 4 , characterized in that

Description

This invention relates to a cover member for an input device, and an input device equipped with the same. Pen input devices that allow input of characters and shapes using an input pen have been known for some time. In such pen input devices, a transparent cover made of a glass substrate or the like is placed on the front side of the display device, such as a liquid crystal display. By bringing the input pen into contact with and moving the pen against this cover, various input operations can be performed. When a glass substrate is used as the cover for a pen input device, the surface of the glass substrate is generally formed with few irregularities and is smooth. As a result, when the input pen is brought into contact with and moved against the surface of the glass substrate, the pen tip tends to slip, resulting in a poor writing experience. For example, Patent Document 1 discloses a method for improving the writing feel of an input pen in a pen input device by creating irregularities on the cover glass surface of the input device to improve friction. The maximum valley depth of the irregularities is 10 to 400 nm, and the average spacing is 500 to 2000 nm. Japanese Patent Publication No. 2018-20942 This is a schematic side cross-sectional view showing the input device.This figure shows the relationship between A, which is the width of the spacing between irregularities in the measurement cross-sectional curve of the main surface, and B, which is the diameter of the tip of an input medium such as an input pen.This figure shows the measured cross-sectional curve of the main surface, the irregularities with large spacing, and the irregularities with small spacing.This figure shows the cutoff values for the high-pass filter λc and the low-pass filter λs.This diagram shows how a pen tip makes contact with the main surface of a glass substrate that has two types of bumps, large and small, with different spacing between the bumps.This diagram shows how the pen tip contacts the main surface of a glass substrate that does not have the smaller of two types of irregularities with different spacing between them.This diagram shows a glass substrate with two types of bumps and grooves of different sizes and spacing widths. The pen tip is in contact with the main surface of the glass substrate where the spacing width of the larger bumps and grooves is greater than the diameter of the pen tip. Next, embodiments for implementing the input device cover member and the input device equipped therewith according to the present invention will be described with reference to the attached drawings. The input device 10 shown in Figure 1 is one embodiment of an input device equipped with an input device cover member according to the present invention. The input device 10 comprises a display element 30 for displaying images, a glass substrate 20 as a cover member disposed on the front side of the display element 30, a digitizer circuit 40 disposed on the back side of the display element 30, and an input pen 50. The glass substrate 20 is an example of a cover member for an input device according to the present invention, and the digitizer circuit 40 is an example of a detection circuit for detecting input according to the present invention. Note that the "front side" of the display element 30 refers to the side on which the image is displayed, and the "back side" of the display element 30 refers to the side opposite to the side on which the image is displayed. In Figure 1, the "front side" of the display element 30 is at the top of the page, and the "back side" is at the bottom of the page. The input device 10 allows input of characters and shapes by moving the input pen 50 while it is in contact with the glass substrate 20. Input to the input device 10 can also be performed by means other than the input pen 50. For example, characters and shapes can be input by moving the user's finger while it is in contact with the glass substrate 20. The input device 10 is, for example, a tablet terminal. This tablet terminal broadly refers to an input display device equipped with a display function and an input function. The tablet terminal includes devices such as tablet PCs, mobile PCs, smartphones, and game consoles. The glass substrate 20 is formed from a transparent glass plate with irregularities formed on at least one main surface 20a. For example, the glass substrate 20 can be made of aluminosilicate glass or borosilicate glass. If the glass substrate 20 is made of alkali-containing aluminosilicate glass, the glass substrate 20 may have a chemically strengthened layer on its surface. Further details of the glass substrate 20 will be described later. The glass substrate 20 is positioned so that the side of the main surface 20a, which has irregularities formed on it, is the side that comes into contact with the input pen 50. The digitizer circuit 40 is equipped with a detection sensor that detects input from an input means such as an input