Glass Materials

Abstract

To provide a glass member having a recess excellent in visibility.SOLUTION: A glass member includes a recess 10. In the glass member, an angle formed between a principal surface 1a of the glass member and an opening end surface 111 of the recess, in a cross-sectional view, is 90° to 130°. In addition, the recess is an annular groove or a circular dent, and a circularity of an outer shape of the recess is 5% or less of an outside dimension. The recess, in a plane view, has a linear shape, and a curved surface on a bottom surface 12. A surface roughness Rq of the bottom surface of the recess is smaller than a surface roughness Rq of a side surface 11 of the recess.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a glass member. [Background technology]

[0002] 2. Description of the Related Art Glass members are known that have marks formed on their surfaces, which are combinations of letters, symbols, figures, etc. from which various information about the glass member can be obtained, for the purpose of managing the manufacturing process of the glass member.

[0003] As an example of a glass member having such a mark, there is disclosed a plate glass having an information display portion on its surface, the constituent units of which are dots formed in annular grooves (see, for example, Patent Document 1). In the plate glass of Patent Document 1, the mark is formed by irradiating the surface of the glass member with a laser, causing the glass to disappear and creating dots in the laser irradiated area.

[0004] Also disclosed is an optical cover glass that includes a flat plate portion and a frame portion, in which a recess surrounded by the flat plate portion and the frame portion is formed by wet etching (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2016-210644 A [Patent Document 2] JP 2011-37694 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, when a mark is processed by irradiating the surface of a glass member with a laser beam as in the technology described in Patent Document 1, the mark is formed by vaporizing the glass by irradiating the glass plate with a high energy density laser beam for a very short time. Therefore, many tiny cracks are likely to form at the boundary between the laser-processed area and the non-processed area, and the outline of the mark may become unclear.

[0007] Furthermore, when processing recesses by etching, as in the technology described in Patent Document 2, the angle of the boundary between the etched and unprocessed areas tends to be gentle, which may result in the outline of the mark becoming unclear.

[0008] When a mark provided on the surface of a glass member is used for positioning the glass member, the visibility of the mark affects the accuracy of positioning. For example, when a glass member is positioned using an optical device that uses a camera and then processed, if the outline of the mark is unclear, the glass member cannot be positioned accurately, and it may not be possible to process the glass member or form a printed layer with high accuracy.

[0009] An object of one aspect of the present invention is to provide a glass member having a recess with excellent visibility. [Means for solving the problem]

[0010] One aspect of the glass member according to the present invention is a glass member having a recess, wherein an angle between a main surface of the glass member and an opening end face of the recess is 90° to 130° in a cross-sectional view. Effect of the Invention

[0011] One embodiment of the present invention can provide a glass member having a recess with excellent visibility. [Brief description of the drawings]

[0012] [Figure 1] FIG. 2 is a plan view of a glass member according to an embodiment of the present invention. [Diagram 2]FIG. 2 is a cross-sectional view of FIG. [Diagram 3] FIG. 2 is an enlarged view of the recess in FIG. [Figure 4] FIG. 2 is a cross-sectional view taken along line II-II of FIG. [Diagram 5] FIG. 5 is a partially enlarged view of FIG. [Figure 6] 3 is a flowchart showing a method for manufacturing a glass member. [Figure 7] 1 is a SEM photograph of a surface including a recess of the glass member of Example 1-1. [Figure 8] 1 is a SEM photograph of a cross section including a recess of the glass member of Example 1-1. [Figure 9] FIG. 9 is a partially enlarged view of FIG. 8. [Figure 10] 1 is a SEM photograph of a surface including a recess of the glass member of Example 1-3. [Figure 11] 1 is a SEM photograph of a cross section including a recess of the glass member of Example 1-3. [Figure 12] FIG. 12 is a partially enlarged view of FIG. [Figure 13] 1 is a SEM photograph of a surface including a recess of the glass member of Example 1-5. [Figure 14] 1 is a SEM photograph of a cross section including a recess of the glass member of Example 1-5. [Figure 15] 1 is a SEM photograph of a surface including a recess of the glass member of Example 3-1. [Figure 16] 1 is a SEM photograph of a surface including a recess of the glass member of Example 3-2. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, an embodiment of the present invention will be described in detail. In order to facilitate understanding of the description, the same components in each drawing are given the same reference numerals, and duplicated description will be omitted. Also, the scale of each member in the drawings may differ from the actual scale. In this specification, a tilde "~" indicating a numerical range means that the numerical values ​​before and after it are included as the lower and upper limits, unless otherwise specified.

[0014] <Glass components> A glass member according to an embodiment of the present invention will be described. Fig. 1 is a plan view of the glass member according to this embodiment, and Fig. 2 is a cross-sectional view taken along line II of Fig. 1. As shown in Figs. 1 and 2, the glass member 1 according to this embodiment is a plate-like member having a recess 10 and a printed layer 20 on its main surface 1a, the main surface 1a being flat, and the recess 10 being used as a mark for positioning the glass member 1. The glass member 1 may be formed in a curved shape.

[0015] The outer shape of the glass member 1 in plan view is not particularly limited, and may include straight lines, curved lines, etc., or may be composed of only curved lines such as a circle or an ellipse. For example, the glass member 1 is formed in a substantially rectangular shape with rounded corners C1 to C4 in plan view, and the rounded corners C1 to C4 have different curvatures. The main surface 1a is the front surface (upper surface) of the glass member 1, and the surface opposite to the main surface 1a is the back surface (lower surface) of the glass member 1. The curvatures of the corners C1 to C4 may all be the same, or at least one of the four corners C1 to C4 may be different. The number of rounded corners may be three or more in the plan view of the glass member 1.

[0016] In this embodiment, glass member 1 can use recess 10 as a mark for positioning glass member 1, so the outer shape of glass member 1 does not have to have straight line portions that are parallel or perpendicular to each other in a plan view. Furthermore, glass member 1 does not have to have an outer shape that has a straight line portion in a plan view. In other words, glass member 1 can be configured without having two straight line portions that intersect at right angles in a plan view.

[0017] The end faces of glass member 1 may be formed substantially perpendicular to main surface 1a and the end of the back surface, or may be formed at an angle.

[0018] Examples of the glass member 1 include a glass wafer (glass substrate), a glass panel, a glass lens, etc. Examples of the material that can be used for the glass member 1 include soda-lime silica glass, borosilicate glass, and aluminosilicate glass.

[0019] The glass member 1 may be physically strengthened or chemically strengthened. When chemically strengthening, ions with a small ionic radius, such as Li ions or Na ions, contained in the surface of the glass member 1 are replaced with ions with a relatively large ionic radius, such as K ions. This forms a compressive stress layer at a predetermined depth from the surface of the glass member 1. By chemically strengthening the glass member 1 and forming a compressive stress layer on the surface of the glass member 1, the strength of the glass member 1 can be improved and damage to the glass member 1 due to contact or the like can be suppressed.

[0020] As shown in Fig. 1, two recesses 10 are formed near different end faces of main surface 1a of glass member 1. Recesses 10 are formed as annular grooves in main surface 1a. Fig. 3 is an enlarged view of recess 10 in Fig. 1, and Fig. 4 is a cross-sectional view taken along line II-II in Fig. 3. As shown in Fig. 3, recess 10 is formed in annular shape in main surface 1a in a plan view, and as shown in Fig. 4, recess 10 forms a groove in a cross-sectional view.

[0021] The recess 10 may be a circular recess, an elliptical groove, an elliptical recess, or the like, in which the contour between the recess 10 and the main surface 1a of the glass member 1 in a planar view is curved. Also, the recess 10 may be a polygonal groove, a polygonal recess, a cross-shaped groove, or the like, in which the contour between the recess 10 and the main surface 1a of the glass member 1 in a planar view is linear. Furthermore, the recess 10 may be a curved and linear contour between the recess 10 and the main surface 1a of the glass member 1 in a planar view.

[0022] The recesses 10 may form symbols, character strings, bar codes, two-dimensional codes, and the like, in addition to the above-mentioned figures.

[0023] The number of recesses 10 formed on main surface 1a of glass member 1 may be one, or may be three or more.

[0024] Recesses 10 may be formed on both main surface 1a of glass member 1 and the main surface opposite to main surface 1a.

[0025] Fig. 5 is a partially enlarged view of Fig. 4. As shown in Fig. 5, the side surface 11 (wall surface) of the recess 10 has an opening end surface 111, a middle side surface 112, and a bottom side surface 113.

[0026] As shown in FIG. 5, when the depth H0 (see FIG. 4) of the recess 10 is taken as 100%, the opening end surface 111 is a side surface between a position 11a (5% depth recess position) of the side surface 11 of the recess 10 at a depth H1 of 5% vertically from the main surface 1a of the recess 10 with respect to the depth H0 (see FIG. 4) of the recess 10 and the main surface 1a.

[0027] Depth H0 of recess 10 is the distance from main surface 1a of glass member 1 to the deepest part of the bottom of recess 10 in cross-sectional view, ie, the maximum depth of bottom surface 12 of recess 10.

[0028] As shown in Figure 4, when the depth H0 of the recess 10 is 100%, the intermediate side 112 is a side between a recess position 11a that is 5% deeper from the main surface 1a in the vertical direction with respect to the depth H0 of the recess 10, and a position (50% deep recess position) 11b of the side 11 of the recess 10 at a depth H2 that is 50% deeper from the main surface 1a in the vertical direction with respect to the depth H0 of the recess 10.

[0029] The bottom side 113 is the side between the middle side 112 and the bottom side 12 as shown in FIG.

[0030] 5, in a cross-sectional view of the recess 10, the angle α between the main surface 1a of the glass member 1 (main surface of the glass member) and the opening end surface 111 of the recess 10 is 90° to 130°. The angle α is preferably 92° to 120°, more preferably 95° to 115°, and further preferably 100° to 110°. When the angle α is 90° to 130°, the boundary between the recess 10 and the main surface 1a is clear, and the outline of the recess 10 can be made clear. In addition, since the angle α is a moderate inclination, the cost required for forming the recess 10 can be reduced.

[0031] The angle α of the opening end surface 111 refers to the angle between the main surface 1a and a straight line drawn from the 5% depth recess position 11a toward the main surface 1a along the shape of the recess 10. When the 5% depth recess position 11a is a curve, the angle α of the opening end surface 111 is the angle between the tangent at the 5% depth recess position 11a and the main surface 1a.

[0032] Of the side surfaces 11 closer to the bottom surface 12 than the opening end surface 111, the middle side surface 112 preferably has an angle β of 90° to 130° with respect to the main surface 1a of the glass member 1 in a cross-sectional view. The angle β is more preferably 92° to 120°, further preferably 95° to 115°, and most preferably 100° to 110°. If the angle β is 90° to 130°, the angle β can be set close to the angle α, so that the change in the inclination of the side surface 11 of the recess 10 can be suppressed. This makes it possible to suppress the boundary between the recess 10 and the main surface 1a from becoming unclear.

[0033] The angle β of the middle side surface 112 refers to the angle between the main surface 1a and a straight line connecting the 5% depth recess position 11a and the 50% depth recess position 11b.

[0034] Moreover, the circularity of the outer shape of the recess 10 in plan view is preferably 5% or less of the outer dimension, more preferably 3% or less, and even more preferably 1% or less. If the circularity of the outer shape of the recess 10 is 5% or less of the outer dimension, the shape of the recess 10 is clearer, and the outline of the recess 10 can be more clearly confirmed.

[0035] The circularity can be determined based on the definition and indication of geometric deviation in JIS B0621-1984.

[0036] As shown in Fig. 4, it is preferable that the recess 10 has a curved bottom surface 12. If the recess 10 has a curved bottom surface 12, the recess 10 can be easily formed, and since the recess 10 has no corners, the recess 10 is less likely to lose its shape. Furthermore, when bending stress or the like is applied to the glass member 1, cracks caused by the recess 10 can be suppressed.

[0037] The surface roughness Rq of the bottom surface 12 is preferably smaller than the surface roughness Rq of the side surface 11 of the recess 10. If the surface roughness Rq of the bottom surface 12 is smaller than the surface roughness Rq of the side surface 11 of the recess 10, the bottom surface 12 can be easily confirmed from the outside, and therefore the recess 10 can be easily recognized from the outside.

[0038] The surface roughness Rq is the root mean square roughness Rq defined in JIS B 0601:2001. This root mean square roughness Rq means the standard deviation of the surface roughness. The surface roughness Rq can be measured using a laser microscope.

[0039] It is preferable that the ratio of the depth H0 of the recess 10 to the thickness of the glass member 1 (depth H0 of the recess 10 / thickness of the glass member 1) satisfies the following formula (1). That is, the ratio of the depth H0 of the recess 10 to the thickness of the glass member 1 is preferably 0.05 to 0.5, more preferably 0.10 to 0.4, and further preferably 0.15 to 0.25. If the ratio of the depth of the recess 10 to the thickness of the glass member 1 is 0.05 to 0.5, the recess 10 can have a sufficient depth for forming a groove, and can be recognized from the outside. In addition, the thickness of the glass member 1 can be sufficiently secured relative to the depth of the recess 10, and therefore the strength of the glass member 1 can be maintained high. 0.05<depth H0 of the recess 10 / thickness of the glass member 1<0.5 (1)

[0040] 1 and 2, the printing layer 20 is provided on the main surface 1a at a position different from the recesses 10 in a plan view. The printing layer 20 is, for example, a model code, a manufacturing number, a light-shielding layer, etc. The recesses 10 can function as alignment marks for positioning when forming the printing layer 20. The printing layer 20 can be formed of a colored ink layer such as black ink.

[0041] Furthermore, the glass member 1 may have an AR film, a light-shielding layer, etc. on its main surface 1a.

[0042] (Method of manufacturing glass members) A method for manufacturing the glass member 1 according to this embodiment will now be described. Fig. 6 is a flow chart showing a method for manufacturing the glass member 1 according to this embodiment.

[0043] As shown in FIG. 6, in the method for manufacturing a glass member according to this embodiment, first, a raw glass plate is prepared (a raw glass plate preparation step: step S11).

[0044] The glass material for forming the raw glass plate may be, for example, borosilicate glass, soda-lime glass, high silica glass, etc. The size, thickness, shape, etc. of the raw glass plate are appropriately selected depending on the application of the glass member 1 as a finished product, etc.

[0045] The raw glass plate can be manufactured by using a known manufacturing method such as a float method, a down-draw method (e.g., an overflow down-draw method), a re-draw method, a press molding method, a pulling method, etc. As a manufacturing method for the raw glass plate, it is preferable to use the float method because it is excellent in productivity and cost.

[0046] Next, the raw glass plate is cut into a plurality of glass substrates (a glass plate cutting process: step S12).

[0047] Methods for cutting the glass raw material include, for example, a method of irradiating the surface of the glass raw material with laser light and cutting by moving the irradiated area of ​​the laser light on the surface of the glass raw material, and a mechanical cutting method using a cutter wheel, etc.

[0048] Next, the glass substrate is processed into the shape as described above in plan view, and the recess 10 is formed on the surface of the glass substrate (processing the outer shape of the glass substrate and forming the recess: step S13). The surface of the glass substrate corresponds to the main surface 1a of the glass member 1 shown in Figures 1 and 2, and hereinafter the surface of the glass substrate is referred to as the main surface 1a.

[0049] The processing of the outer shape of the glass substrate and the formation of the recess 10 are performed simultaneously, but they may be performed separately. When performed separately, the recess 10 is formed, and then the outer shape is processed using the recess 10 as a reference. In this manner, the outer shape can be processed with high accuracy. In addition, the thickness of the glass substrate may be processed to an appropriate thickness before, after, or simultaneously with the processing of the outer shape of the glass substrate. Methods for processing the thickness of the glass substrate include polishing and slimming (chemical polishing using a chemical solution).

[0050] The processing of the outer shape, such as the outline shape, of the glass substrate and the formation of the recess 10 can be carried out by using a combination of a laser and wet etching.

[0051] The laser is CO 2 Lasers, Nd:YAG lasers, etc. can be used, and a semiconductor laser pumped YAG laser is preferable because of its good focusing ability. By focusing the laser on the main surface 1a of the glass substrate, a modified region can be formed on the main surface 1a of the glass substrate and below it. When focusing the laser, it is preferable to use a femtosecond laser because the glass substrate around the laser focusing portion is hardly thermally or chemically damaged.

[0052] Wet etching is performed by immersing the glass substrate in an etching solution. It is preferable to use an etching solution that is optimal for the material constituting the glass member 1, and suitable solutions include aqueous solutions containing fluorides such as hydrogen fluoride, ammonium fluoride, potassium fluoride, and sodium fluoride; aqueous solutions containing inorganic acids such as hydrochloric acid, sulfuric acid, phosphoric acid, and nitric acid; and aqueous solutions containing organic acids such as acetic acid and succinic acid. These may be used alone or in combination of two or more.

[0053] After forming modified regions by irradiating the outer peripheral surface and specific positions of the main surface 1a of the glass substrate with a laser, the glass member is immersed in an etching solution to perform wet etching. When the glass member is immersed in the etching solution, the etching solution penetrates more easily into the modified regions formed by irradiating the laser than into the non-modified regions not irradiated with the laser, and the modified regions can be more rapidly etched than the non-modified regions. Therefore, the etching rate of the modified regions is higher than that of the unmodified regions, and therefore the modified regions can be more rapidly etched than the unmodified regions.

[0054] This allows for the formation of an arbitrary contour shape that follows the modified region, and results in a glass member 1 that is processed to have a generally rectangular shape with rounded corners in a plan view, with each corner having a different curvature. An annular recess 10 that follows the modified region can be formed at a specific position on main surface 1a of glass member 1.

[0055] Next, the main surface 1a and the back surface of the glass member 1 are chemically strengthened (chemical strengthening step: step S14).

[0056] By chemically strengthening the glass member 1, ions with a small ionic radius, such as Li ions and Na ions, contained in the principal surface 1a and rear surface of the glass member 1 are replaced with ions with a relatively large ionic radius, such as K ions. This forms a strengthened layer to a predetermined depth from the principal surface 1a and rear surface of the glass member 1. By chemically strengthening the glass member 1 and forming a strengthened layer on the principal surface 1a and rear surface of the glass member 1, the strength of the glass member 1 can be improved and damage to the glass member 1 due to contact, etc. can be suppressed.

[0057] Next, a printed layer 20 is formed in the vicinity of the end face of the main surface 1a of the glass member 1 (printed layer forming step: step S15).

[0058] The printed layer 20 can be formed using a printing method such as spray printing, inkjet printing, screen printing, etc. Among them, screen printing is preferably used because it is easy to form the printed layer 20 into a desired shape while making the average thickness of the printed layer 20 uniform.

[0059] As a result, a glass member 1 having a printed layer 20 on a main surface 1a is obtained.

[0060] If necessary, an anti-reflection coating or a light-shielding layer may be formed on the main surface 1a and / or the back surface of the glass member 1 to perform anti-reflection treatment.

[0061] In this manner, glass member 1 has recess 10 on principal surface 1a, and recess 10 is formed such that angle α between principal surface 1a of glass member 1 and opening end surface 111 is 90° to 130° in a cross-sectional view. This allows glass member 1 to clearly define the boundary between recess 10 and principal surface 1a and to clearly define the outline of recess 10, making it easier to recognize recess 10 from the outside. Thus, glass member 1 can have recess 10 with excellent visibility.

[0062] Furthermore, by setting the angle α between the main surface 1a and the opening end surface 111 of the glass member 1 to be 90° to 130°, the angle α has a suitable inclination and the burden of forming the recess 10 can be reduced, thereby suppressing the cost required for forming the recess 10.

[0063] Furthermore, since recesses 10 can be formed in glass member 1 at the same time as processing the contour shape thereof, recesses 10 can be formed without increasing the number of processing steps. Therefore, glass member 1 can be manufactured at reduced costs.

[0064] In the cross-sectional view of recess 10, glass member 1 can have a side surface closer to bottom surface 12 than opening end surface 111, that is, intermediate side surface 112, at an angle β of 90° to 130° with bottom surface 12 and main surface 1a of glass member 1. This can suppress the change in inclination of side surface 11 of recess 10 from opening end surface 111 to bottom surface 12, and can suppress the boundary between recess 10 and main surface 1a from becoming unclear, thereby making the outline of recess 10 clearer. Thus, glass member 1 can make recess 10 easier to recognize, and can further improve the visibility of recess 10.

[0065] In the glass member 1, the recesses 10 can be formed as annular grooves. This allows the recesses 10 to be easily formed on the main surface 1a. Furthermore, by forming the recesses 10 in an annular shape, the recesses 10 can be recognized as having substantially the same shape in all directions, thereby improving the visibility of the recesses 10.

[0066] In glass member 1, the circularity of the outer shape of recess 10 in a plan view can be set to 5% or less of the outer dimension. This allows the outer shape of recess 10 to be more clearly grasped, making recess 10 easier to check and thus improving the visibility of recess 10.

[0067] In the glass member 1, the recess 10 can include a linear shape in a plan view. By forming the recess 10 to include a linear shape, the recess 10 can be easily formed on the main surface 1a. In addition, the outer shape of the recess 10 can be more clearly grasped, so that the visibility of the recess 10 can be further improved. Furthermore, the shape of the bottom surface 12 is less likely to collapse, and the shape of the recess 10 can be stably maintained, so that a decrease in the visibility of the recess 10 is suppressed.

[0068] Glass member 1 can have a curved surface on bottom surface 12 of recess 10. As a result, bottom surface 12 can be formed to be curved, so that the shape of bottom surface 12 is less likely to collapse and the shape of recess 10 can be stably maintained compared to when recess 10 has a corner between side surface 11 and bottom surface 12. Thus, glass member 1 can prevent a decrease in visibility of recess 10.

[0069] In glass member 1, the surface roughness Rq of bottom surface 12 of recess 10 can be made smaller than the surface roughness Rq of side surface 11 of recess 10. This makes it easier to check bottom surface 12 from the outside, making recess 10 easier to recognize and further improving the visibility of recess 10.

[0070] Glass member 1 can have a depth of recess 10 / thickness of glass member 1 of 0.05 to 0.5. This allows recess 10 to have a predetermined depth relative to the thickness of glass member 1, while suppressing a decrease in the strength of glass member 1. Therefore, glass member 1 can make recess 10 easily recognizable from the outside, and can maintain the strength of glass member 1.

[0071] Glass member 1 can be formed so that its outer shape has no straight line portions that are parallel or perpendicular to each other in a plan view. As a result, even if the outer shape of glass member 1 is difficult to use as a positioning reference, the position of glass member 1 can be accurately grasped by using recess 10 as a mark, so that glass member 1 can be positioned with high precision.

[0072] Glass member 1 can also be formed so that its outer shape has no straight line portions in a plan view. As a result, even if glass member 1 has an outer shape that is difficult to use as a positioning reference, such as a circle in a plan view, the position of glass member 1 can be accurately grasped by using recess 10 as a mark, so that glass member 1 can be positioned with high precision.

[0073] Glass member 1 can include printed layer 20 at a position different from recess 10 in plan view. Glass member 1 can have recess 10 function as an alignment mark for positioning when forming printed layer 20, etc., and therefore the positional accuracy of printed layer 20 and the like formed on main surface 1a can be improved.

[0074] In this way, glass member 1 is provided with recess 10 that has excellent visibility, so that glass member 1 can be easily and accurately positioned even if glass member 1 is formed of irregularly shaped glass. For this reason, glass member 1 is suitable for use with glass articles that are unlikely to have straight line portions in a plan view and that tend to include curved surfaces on the surface, such as cover glasses and protective glasses for imaging devices.

[0075] In this embodiment, glass member 1 may have alignment portions on its end faces, orientation flats formed by cutting out part of its outer periphery, and the like. EXAMPLES

[0076] The following examples are provided to further explain the present invention, but the present invention is not limited to these examples. Examples 1-1 to 1-4, 2-1 to 2-12, 3-1, and 3-2 are working examples, and Example 1-5 is a comparative example.

[0077] <Example 1-1> [Preparation of glass components] A soda lime glass (AS2 glass, manufactured by AGC) with outer dimensions of 100 mm x 100 mm and thickness of 400 μm was prepared as a glass member, and a modified region was formed on the surface of the glass member by irradiating the surface with a laser in a circular shape. After that, the glass member was immersed in an etching solution and the surface of the glass member was etched to form a circular recess on the surface of the glass member.

[0078] [Evaluation of recesses] The surface of the glass member including the recess was observed by SEM. The surface of the glass member including the recess is shown in FIG. 7. The glass member with the recess formed thereon was then embedded in resin. The side surface of the glass member was then polished to expose the cross section of the recess, and the cross section of the recess was observed by SEM. The cross section of the glass member including the recess is shown in FIG. 8, and a partially enlarged view of FIG. 8 is shown in FIG. 9. As shown in FIG. 7 to FIG. 9, the recess was formed as a circular groove, and the outline of the recess and the surface of the glass member could be clearly recognized, and it was confirmed that the visibility of the recess was high. It was also confirmed that the bottom surface of the recess had a curved surface. The results of the visibility of the recess are shown in Table 1. In Table 1, the visibility of the recess is shown based on the following evaluation criteria. (Evaluation Criteria) ◯: The outline between the recess and the surface of the glass member is clearly recognizable, and the recess is highly visible. ×: The outline between the recess and the surface of the glass member is unclear, and the visibility of the recess is low.

[0079] From the cross-sectional view of the recess shown in Figure 9, the opening diameter and depth of the recess were measured, and the angle of the opening end face, the angle of the middle side face, the radius of curvature of the bottom face, and the depth of the recess / glass thickness were calculated. Note that the left side of the opening end face angle and the middle side face angle recess is the inner side face of the glass member in the cross-section of the recess, and the right side is the outer side face of the glass member in the cross-section of the recess. The measurement results of the opening diameter, depth, angle of the opening end face, angle of the middle side face, and the radius of curvature of the bottom face, and the depth of the recess / glass thickness are shown in Table 1.

[0080] The angle of the opening end face is the angle between the surface of the glass member and a straight line drawn from the position of the side of the recess at a depth of 5% from the main surface in a vertical direction relative to the depth of the recess (5% depth recess position) toward the surface of the glass member along the shape of the recess, assuming the depth of the recess to be 100%. The angle of the intermediate side face is the angle between the surface of the glass member and a straight line connecting the 5% depth recess position and the position of the side of the recess at a depth of 50% from the main surface in a vertical direction relative to the depth of the recess (50% depth recess position).

[0081] The surface roughness Rq of the recess was measured using a laser microscope (shape measuring laser microscope VK-100, manufactured by Keyence Corporation). The bottom located at the center of the opening of the recess and the curved surface area around it were defined as the bottom surface. The inner side surface of the glass member in the cross section of the recess was defined as the left side surface, and the outer side surface of the glass member in the cross section of the recess was defined as the right side surface. The measurement results of the surface roughness Rq of the bottom surface, left side surface, and right side surface of the recess are shown in Table 1.

[0082] <Example 1-2> In Example 1-1, the procedure was the same as in Example 1-1, except that the recess was formed so that the opening diameter was 110 μm and the depth was 69 μm. The recess was formed as a circular groove as in Example 1-1, and the outline between the recess and the surface of the glass member was clearly recognizable, confirming that the visibility of the recess was high. It was also confirmed that the bottom surface of the recess had a curved surface. Table 1 shows the results of measuring the opening diameter, depth, angle of the opening end face, angle of the middle side face, and radius of curvature of the bottom surface, as well as the depth of the recess / glass thickness of the recess formed in the glass member, and the evaluation results of visibility.

[0083] <Example 1-3> In Example 1-1, the procedure was the same as in Example 1-1, except that the recess was formed so that the opening diameter was 112 μm and the depth was 93 μm. FIG. 10 shows the surface including the recess of the glass member, FIG. 11 shows a cross section including the recess of the glass member, and FIG. 12 shows a partially enlarged view of FIG. 11. As shown in FIG. 10 to FIG. 12, the recess was formed in a circular groove like in Example 1-1, and the outline of the recess and the surface of the glass member could be clearly recognized, and it was confirmed that the visibility of the recess was high. It was also confirmed that the bottom surface of the recess had a curved surface. Table 1 shows the results of measuring the opening diameter, depth, angle of the opening end face, angle of the middle side face, and radius of curvature of the bottom surface, depth of the recess / glass thickness, and surface roughness Rq of the recess formed in the glass member, as well as the evaluation results of visibility.

[0084] <Example 1-4> In Example 1-1, the procedure was the same as in Example 1-1, except that the recess was formed so that the opening diameter was 112 μm and the depth was 94 μm. The recess was formed as a circular groove like Example 1-1, and the outline between the recess and the surface of the glass member was clearly recognizable, confirming that the visibility of the recess was high. It was also confirmed that the bottom surface of the recess had a curved surface. Table 1 shows the results of measuring the opening diameter, depth, angle of the opening end surface, angle of the middle side surface, and radius of curvature of the bottom surface, as well as the depth of the recess / glass thickness of the recess formed in the glass member, and the evaluation results of visibility.

[0085] <Example 1-5> A resist was formed on the surface of a borosilicate glass (FP-1 glass, manufactured by AGC Techno Glass Co., Ltd.) with an outer dimension of 100 mm x 100 mm and a thickness of 1.0 mm as a glass member, and the surface was masked with a resist, followed by dry etching to form a rectangular recess (6 mm x 5 mm, depth 400 μm) in the glass member. The surface of the glass member including the recess is shown in FIG. 13, and the cross section of the glass member including the recess is shown in FIG. 14. As shown in FIG. 13 and FIG. 14, the recess forms a gentle side from the main surface of the glass member to the bottom surface of the recess, and the outline between the recess and the surface of the glass member is unclear, and it was confirmed that the visibility of the recess is low. Table 1 shows the results of measuring the depth, the angle of the opening end face, and the angle of the middle side face of the recess formed in the glass member, as well as the depth of the recess / glass thickness, and the evaluation results of the visibility.

[0086] [Table 1]

[0087] As shown in Table 1, in Examples 1-1 to 1-4, the recesses were clearly visible, but in Example 1-5, the recesses were unclear. Therefore, unlike Example 1-5, in Examples 1-1 to 1-4, the angle of the opening end face is set to 124° or less, so that the outline between the recesses and the surface of the glass member can be clearly recognized and the recesses have excellent visibility, and therefore it can be said that the recesses can be effectively used as positioning marks.

[0088] <Example 2-1 to Example 2-12> Glass members were produced in the same manner as in Example 1-1. The glass members of Examples 2-1 to 2-12 had an opening end face angle (average of the left and right sides) in the range of 104° to 125°, and an intermediate side face angle (average of the left and right sides) in the range of 102° to 115°. The outer dimensions and roundness of the recessed portion of the produced glass members were measured using a CNC image measuring system (NEXIV, manufactured by Nikon Instech Co., Ltd.), and the ratio of the roundness to the outer dimensions was calculated. The outer dimensions of the recessed portion formed in the glass member, the roundness of the recessed portion, and the calculation results of the ratio of the roundness to the outer dimensions are shown in Table 2.

[0089] In addition, the surface and cross section of the recess were observed in the same manner as in Example 1-1, and it was confirmed that the recess was formed as a circular groove, the outline between the recess and the surface of the glass member was clearly recognizable, and the visibility of the recess was high. It was also confirmed that the bottom surface of the recess had a curved surface. The visibility evaluation results are shown in Table 2.

[0090] [Table 2]

[0091] As shown in Table 2, the recesses were clearly visible in all of Examples 2-1 to 2-12. Therefore, in Examples 2-1 to 2-12, by setting the ratio of circularity to outer dimension to approximately 0.40 or less, the outline between the recesses and the surface of the glass member was clearly recognizable and the recesses had excellent visibility, so that it can be said that they can be effectively used as positioning marks.

[0092] <Example 3-1 and Example 3-2> Glass members were produced in the same manner as in Example 1-1. The surface including the recesses of the glass member of Example 3-1 is shown in FIG. 15, and the surface including the recesses of the glass member of Example 3-2 is shown in FIG. 16. As shown in FIG. 15, it was confirmed that the glass member of Example 3-1 had a symbol formed thereon consisting of annular grooves and straight lines. In addition, as shown in FIG. 16, it was confirmed that the glass member of Example 3-2 had a matrix-type two-dimensional code formed thereon in which multiple circular depressions were arranged.

[0093] Therefore, in Examples 3-1 and 3-2, the outline between the recess and the main surface of the glass member is clearly recognizable, and the recess has excellent visibility, so that it can be said that they can be effectively used as identification marks.

[0094] Although the embodiment has been described above, the above embodiment is presented as an example, and the present invention is not limited to the above embodiment. The above embodiment can be implemented in various other forms, and various combinations, omissions, substitutions, modifications, etc. can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0095] 1 Glass components 1a Main surface (front surface) 10 Recess 11 Side 111 Open end face 112 Middle side 12 Bottom 20 printing layer

Claims

1. A glass member having a recess, an angle between a main surface of the glass member and an opening end surface of the recess is 90° to 130° in a cross-sectional view; In a cross-sectional view, a side surface of the recess that is closer to a bottom surface than the opening end surface has an angle of 90° to 130° with respect to a main surface of the glass member, A glass member in which the surface roughness Rq of a bottom surface of the recess is smaller than the surface roughness Rq of a side surface of the recess.

2. The glass member according to claim 1 , wherein the recess is an annular groove or a circular depression.

3. 3. The glass member according to claim 2, wherein the circularity of the outer shape of the recess in a plan view is 5% or less of the outer dimension.

4. The glass member according to claim 1 , wherein the recess includes a linear shape in a plan view.

5. 5. The glass member according to claim 1, wherein the recess has a curved bottom surface.

6. 6. The glass member according to claim 1, wherein the ratio of the depth of the recess to the thickness of the glass member is 0.05 to 0.

5.

7. 7. The glass member according to claim 1, wherein the outer shape of the glass member does not have straight line portions that are in a parallel or perpendicular positional relationship with each other in a plan view.

8. The glass member according to claim 7 , wherein the outer shape of the glass member does not include any straight line portions in a plan view.

9. The glass member according to any one of claims 1 to 8, further comprising a printed layer at a position different from the recess in plan view.

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